Differential Flow Analysis for Gas Emission Measurement

1998 ◽  
Author(s):  
Edward J. Vinarcik
Keyword(s):  
Flow Analysis ◽  
Emission Measurement ◽  
Gas Emission ◽  
Differential Flow

scholarly journals SO2 EMISSION MEASUREMENT BY DOAS (DIFFERENTIAL OPTICAL ABSORPTION SPECTROSCOPY) AND COSPEC (CORRELATION SPECTROSCOPY) AT MERAPI VOLCANO (INDONESIA)

2010 ◽  
Vol 8 (2) ◽  
pp. 151-157 ◽  
Author(s):  
Hanik Humaida
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Spare Part ◽  
Correlation Spectroscopy ◽  
Differential Optical Absorption Spectroscopy ◽  
Optical Absorption Spectroscopy ◽  
Emission Measurement ◽  
Gas Emission ◽  
So2 Emission ◽  
So2 Gas

The SO2 is one of the volcanic gases that can use as indicator of volcano activity. Commonly, SO2 emission is measured by COSPEC (Correlation Spectroscopy). This equipment has several disadvantages; such as heavy, big in size, difficulty in finding spare part, and expensive. DOAS (Differential Optical Absorption Spectroscopy) is a new method for SO2 emission measurement that has advantages compares to the COSPEC. Recently, this method has been developed. The SO2 gas emission measurement of Gunung Merapi by DOAS has been carried out at Kaliadem, and also by COSPEC method as comparation. The differences of the measurement result of both methods are not significant. However, the differences of minimum and maximum result of DOAS method are smaller than that of the COSPEC. It has range between 51 ton/day and 87 ton/day for DOAS and 87 ton/day and 201 ton/day for COSPEC. The measurement of SO2 gas emission evaluated with the seismicity data especially the rockfall showed the presence of the positive correlation. It may cause the gas pressure in the subsurface influencing instability of 2006 eruption lava.   Keywords: SO2 gas, Merapi, DOAS, COSPEC

scholarly journals A Drone-Enabled Approach for Gas Leak Detection Using Optical Flow Analysis

2021 ◽  
Vol 11 (4) ◽  
pp. 1412
Author(s):  
Parham Nooralishahi ◽  
Fernando López ◽  
Xavier Maldague
Keyword(s):  
Flow Analysis ◽  
Leak Detection ◽  
Gas Emission ◽  
Imaging Technologies ◽  
Industrial Sites ◽  
Gas Leak ◽  
Inspection Process ◽  
Real Scenario ◽  
Gas Leaks ◽  
Suitable Technique

The recent development of gas imaging technologies has raised a growing interest for various applications. Gas imaging can significantly enhance functional safety by early detection of hazardous gas leaks. Moreover, optical gas imaging technologies can be used to identify possible gas leakages and to investigate the amount of gas emission in industrial sites, which is essential, primarily based on current efforts to decrease greenhouse gas emissions all around the world. Therefore, exploring the solutions for automating the inspection process can persuade industries for more regular tests and monitoring. One of the main challenges in gas imaging is the proximity condition required for data to be more reliable for analysis. Therefore, the use of unmanned aerial vehicles can be very advantageous as they can provide significant access due to their maneuver capabilities. Despite the advantages of using drones, their movements and sudden motions during hovering can diminish data usability. In this paper, we propose a method for gas leak detection and visually-enhancement of gas emanation involving stabilization and gas leak detection steps. In addition, a comparative analysis of candidate stabilization techniques is conducted to find the most suitable technique for the drone-based application. Moreover, the system is evaluated using three experiments respectively on an isolated environment, a real scenario, and a drone-based inspection.

Combinations of soil materials for granular capillary barriers for minimizing rainfall infiltration and gas emission

2017 ◽  
Vol 54 (11) ◽  
pp. 1580-1591 ◽  
Author(s):  
L.M. Zhang ◽  
Y.Q. Ke
Keyword(s):  
Critical Role ◽  
Flow Analysis ◽  
Soil Layer ◽  
Silty Sand ◽  
Water Infiltration ◽  
Water Retention Capacity ◽  
Gas Emission ◽  
Clayey Sand ◽  
Retention Capacity ◽  
Local Soil

This paper presents a coupled air–water flow analysis to evaluate the performance of a three-layer capillary barrier for controlling water infiltration into and gas emission from a waste containment system in a high precipitation environment, and to optimize combinations of local soil layers for barrier construction. A multi-phase flow model is proposed considering the movements of the gas and water phases simultaneously. The governing partial differential equations are solved in COMSOL Multiphysics software. Several combinations of lean clay with sand (CL), clayey sand with gravel (SC), silty sand with gravel (SM), sandy silt (ML), and well-graded gravel with silt (GW–GM) are examined. The rates of percolation water and gas emission are used as indicators to compare the performance of different combinations. A fine-grained surface soil layer reduces both water infiltration and gas emission due to its low desaturation rate and high water-retention capacity. The coarse middle layer plays a critical role, promoting capillary effects and hindering water infiltration during rainfall as well as draining any infiltrated water or percolated gas.

Greenhouse gas emission measurement and economic analysis of Iran natural gas fired power plants

Energy Policy ◽  
2013 ◽  
Vol 60 ◽  
pp. 200-207 ◽  
Author(s):  
H. Shahsavari Alavijeh ◽  
A. Kiyoumarsioskouei ◽  
M.H. Asheri ◽  
S. Naemi ◽  
H. Shahsavari Alavije ◽  
...  
Keyword(s):  
Natural Gas ◽  
Economic Analysis ◽  
Greenhouse Gas ◽  
Power Plants ◽  
Greenhouse Gas Emission ◽  
Emission Measurement ◽  
Gas Emission

Differential Flow Analysis of Exhaled Nitric Oxide in Patients With Asthma of Differing Severity

CHEST Journal ◽  
2007 ◽  
Vol 131 (5) ◽  
pp. 1353-1362 ◽  
Author(s):  
Caterina Brindicci ◽  
Kazuhiro Ito ◽  
Peter J. Barnes ◽  
Sergei A. Kharitonov
Keyword(s):  
Nitric Oxide ◽  
Flow Analysis ◽  
Exhaled Nitric Oxide ◽  
Differential Flow

Production flow analysis

1963 ◽  
Vol 42 (12) ◽  
pp. 742 ◽  
Author(s):  
John L. Burbidge
Keyword(s):  
Flow Analysis ◽  
Production Flow
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